JavaFX更改父FXML中的标签

Question

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我是否可以从子控制器-b更改父FXML-A中标签的文本？

Answer 1

在controllerb中定义StringProperty:

public class ControllerB {

    private StringProperty text = new SimpleStringProperty();

    public StringProperty textProperty() {
        return text ;
    }

    public final String getText() {
        return textProperty().get();
    }

    public final void setText(String text) {
        textProperty().set(text);
    }

    // other code as before ...

}

在Controllera中加载第二个fxml时，将标签的文本绑定到TextProperty:

public class ControllerA {

    @FXML
    private Label label ;

    @FXML
    private StackPane parentStackPane ;

    @FXML
    private void someHandlerMethod() throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("FxmlFileB.fxml"));
        Parent rootB = loader.load();
        ControllerB controllerB = loader.getController();
        label.textProperty().unbind();
        label.textProperty().bind(controllerB.textProperty());
        parentStackPane.getChildren().setAll(rootB);
    }

    // other code as before...
}

现在，当您在controllerb中调用settext(...)时，它将更新标签中的文本。